.big_d {
  height: 50px;
  background: red; }

.min_d {
  width: 1200px;
  height: 100%;
  background: red;
  margin: auto; }
  .min_d ul li {
    width: 100px;
    height: 50px;
    text-align: center;
    line-height: 50px;
    display: inline-block; }
